Arctic wolves attack a musk ox calf on Canada's Ellesmere Island, but the herd rushes to its defense. When threatened, musk oxen will form a defensive circle around the calves, the sick and the elderly.

Producer Kathryn Jeffs and Orca Scientist John Durban explain how biologists track killer whales in Antarctica using satellite tags. This allowed the Frozen Planet film crew to pinpoint the location of the orcas.

Recent Videos in Earth Science

The most extreme shoot on the Frozen Planet series? Hands down, the Adelie penguin shoot: a grueling 4-month exercise in isolation and endurance. The two filmmakers nearly lost their minds, but came back with brilliant footage.

Frozen Planet filmmakers felt a moral imperative to document the polar regions before they change forever. Due to climate change, the Arctic and Antarctic are changing faster than anywhere else on the planet.

Frozen Planet marks the first aerial shots of the South Pole. Series producer Vanessa Berlowitz is amazed by how much has changed at the South Pole, and how much has stayed the same, over the past 100 years.

Arctic wolves attack a musk ox calf on Canada's Ellesmere Island, but the herd rushes to its defense. When threatened, musk oxen will form a defensive circle around the calves, the sick and the elderly.